Depends on the results you are trying to reach for. I was trying to lose weight so I did more cardio than weights and it helped. If you are trying to tone and optimize muscle then you should lift weights first and then do some cardio. If you are do cardio first it will put your body into a more fat burning mode and that can also burn muscle mass too but if you lift weights first it will still burn fat but you will retain muscle mass better.

There is also a staggered approach to this method which requires circuits and neatly combines the best of the strength,cardio,flexibility,balance,breath control,and recovery worlds...which is the approach that I use most commonly.I rarely go to the weight room...haven't been there in 7 years,only just started going back...but the principles in this routine works marvels for my clients:

Do a complex lifting routine sandwiched by athletic conditioning,not just merely cardio,and crack off a 90-120 second stretching,breathing and balance sequence in between sets for your active rest.

EXAMPLE:

1 minute jump rope or jumping jack to up your heart rate; if it's a jumprope? Try to get to 120-180 jumps per minute. If it's jumping jacks? 90-120 jumping jacks per minute. Go immediately without rest to:

Bench Press (Barbells or Dumb bells) for one set of up to 12 reps in 20 seconds or less. Go immediately without rest to:

20 seconds of plyometric depth-drop pushups max number of reps,never less than 8

Go immediately to 20 seconds of Rows,Barbell,Dumb bell,or Machine. Max number of reps,never less than 10 reps.

cardio uses alll ur glycogen so do it after at the right heart range or do very light cardio before legs for the goood of ur heart

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This is ALSO true,but depends upon the intensity of your cardio training and whether or not you supplement DURING training.I cycle all of the dominant athletic approaches in order to propagate constant evolution and improvement,feel me?

Cardio before and after a workout is for people looking to lose weight..

the body must go through calories and carbs before it starts burning fat

doing cardio before uses up the calories
resistance training burns through the carbs
and after all the carbs are depleted the body taps into it's fat reserves for energy, therefore cardio before and after a workout is for people looking to shed fat.

this wouldn't be a smart decision for a lean muscular person looking to bulk up or maintain...I do a brisk power walk on an inclined treadmill for about 10 minutes before my leg workouts because I want to open up the vessels in my legs so they can absorb nutrients and get petter pumps.

Depends on the results you are trying to reach for. I was trying to lose weight so I did more cardio than weights and it helped. If you are trying to tone and optimize muscle then you should lift weights first and then do some cardio. If you are do cardio first it will put your body into a more fat burning mode and that can also burn muscle mass too but if you lift weights first it will still burn fat but you will retain muscle mass better.

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Precisely. I noticed a huge difference once I started doing cardio after lifting weights..you have a ton more energy while lifting, and your metabolism goes into overdrive. lol